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Related Concept Videos

Phase Contrast and Differential Interference Contrast Microscopy01:26

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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
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Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...
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Two-dimensional (2D) microscopy encompasses a range of optical techniques that capture images within a single focal plane, offering detailed representations of microscopic structures. These techniques are essential in biological and medical research, enabling the visualization of cellular and subcellular structures with different levels of contrast and specificity.There are several major types of 2D microscopy, each with strengths and applications.Bright-Field MicroscopyBright-field microscopy...
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Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
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Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
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Related Experiment Video

Updated: Dec 10, 2025

Simultaneous Brightfield, Fluorescence, and Optical Coherence Tomographic Imaging of Contracting Cardiac Trabeculae Ex Vivo
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Dynamic contrast in scanning microscopic OCT.

Michael Münter, Malte Vom Endt, Mario Pieper

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    |September 2, 2020
    PubMed
    Summary
    This summary is machine-generated.

    Dynamic contrast in optical coherence tomography (OCT) enhances visualization of cellular structures. Scanning frequency-domain OCT (FD-OCT) offers faster, depth-resolved imaging for histology-like analysis of unstained tissues.

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    Area of Science:

    • Biomedical Optics
    • Medical Imaging
    • Histopathology

    Background:

    • Optical coherence tomography (OCT) offers high resolution but struggles with cellular contrast.
    • Dynamic OCT signal fluctuations can reveal cellular and subcellular structures.

    Purpose of the Study:

    • To demonstrate dynamic contrast imaging using scanning frequency-domain OCT (FD-OCT).
    • To leverage FD-OCT's advantages for faster, depth-resolved histological analysis of unstained tissues.

    Main Methods:

    • Utilized scanning frequency-domain OCT (FD-OCT) to evaluate dynamic OCT signal fluctuations.
    • Explored depth-resolved imaging capabilities for tissue layer visualization.

    Main Results:

    • Demonstrated dynamic contrast in scanning FD-OCT, enabling visualization of cellular structures.
    • Achieved faster acquisition times and reduced motion artifacts compared to FF-OCT.
    • Showcased tomographic depth-sectioning for histology-like perspectives.

    Conclusions:

    • Dynamic contrast in FD-OCT is a promising technique for unstained tissue histological analysis.
    • Scanning FD-OCT provides significant advantages in speed and depth resolution for microscopic imaging.
    • This method facilitates histology-like analysis without the need for tissue staining.